 | Mrs. Marcet (Jane Haldimand) - 1821 - عدد الصفحات: 350
...which they cannot approach to their eyes ; this is to place a concave lens, CD, (fig. 1. plate XXII.) before the eye, in order to increase the divergence...from a distant object fall on the pupil, as divergent ae those from a less distant object; and, with short-sighted people, they throw the image of a distant... | |
 | Mrs. Marcet (Jane Haldimand) - 1821 - عدد الصفحات: 366
...those which are already divergent, still more so. By the assistance of such glasses therefore, the lays from a distant object fall on the pupil, as divergent...devise for such persons as have a contrary defect in their sight; that is to say, in whomjthe crystalline humor, being too fiat, does not refract the... | |
 | Mrs. Marcet (Jane Haldimand) - 1824 - عدد الصفحات: 370
...which they can not approach to their eyes; this is to place a concave lens, CD, (fig. 1 . plate XXII.) before the eye, in order to increase the divergence...devise for such persons as have a contrary defect in their sight; that is to say, in whom the crystalline humour, being too flat, does not refract the... | |
 | Mrs. Marcet (Jane Haldimand), John Lauris Blake - 1826 - عدد الصفحات: 308
...reverse of a convex one: it renders parallel rays divergent, and those which are already divergent, stijl more so. By the assistance of such glasses, therefore,...Caroline. This is an excellent contrivance, indeed. Mrs. Bi And tell me, what remedy would you devise for such persons as have a contrary defect in their sight;... | |
 | 1832 - عدد الصفحات: 650
...the divergence of the rays, the effect of a concave lens being exactly the reverse of a convex one. By the assistance of such glasses, therefore, the...image of a distant object back as far as the retina. Those who suffer from the crystalline humour being too flat, apply an opposite remedy : that is (o... | |
 | 1832 - عدد الصفحات: 640
...the divergence of the rays, the effect of a concave lens being exactly the reverse of a convex one. By the assistance of such glasses, therefore, the...from a distant object fall on the pupil as divergent ав those from a less distant object ; and, with short-sighted people, they throw the image of a distant... | |
 | Ireland commissioners of nat. educ - 1835 - عدد الصفحات: 398
...the divergence of the rays, the effect of a concave lens being exactly the reverse of a convex one. By the assistance of such glasses, therefore, the...image of a distant object back as far as the retina. Those who suffer from the crystalline humour being too flat, apply an opposite remedy : that is to... | |
 | 1836 - عدد الصفحات: 424
...the divergence of the rays, the effect of a concave lens, being exactly the reverse of a convex one. By the assistance of such glasses, therefore, the...image of a distant object back as far as the retina. Those who suffer from the crystalline humour being too flat, apply an opposite remedy : that is to... | |
 | Mrs. Marcet (Jane Haldimand), John Lauris Blake - 1836 - عدد الصفحات: 540
...lens is, you know, exactly the reverse of a convex one ; it renders convergent rays less convergent, parallel rays divergent, and those which are already...the rays from a distant object fall on the pupil as PLATF. JXll Fiy 1. 1Cby ri>nainan£CCJune 1'.* i8ia I divergent as those from a less distant object... | |
 | Mrs. Marcet (Jane Haldimand) - 1837 - عدد الصفحات: 358
...which they cannot approach to their eyes; this is to place a concave lens, CD, (fig. 1, plate XXII.) before the eye, in order to increase the divergence...Caroline. This is an excellent contrivance, indeed. Mrs. V. And tell me, what remedy would you devise for such persons as have a contrary defect in their sight... | |
| |
The effect of a concave lens is, you know, exactly the reverse of a convex one: it renders parallel rays divergent, and those which are already divergent, still more so. By the assistance of such glasses, therefore, the rays from a distant object fall... 
